<?php if($block_id != ''):?>
    <div id="test_box">
        <?php echo $form['test']->renderError() ?>
        <?php echo $form['test'] ?>
    </div>
    <div id="submit">
        <input type="submit" value="старт"/>
    </div>
    <script type="text/javascript">
        $('#Teststart_test').change(function() {
        value_subj = $('#Teststart_test').attr('value');

        if(value_subj == '')
        {
            jQuery("div#submit").hide();
        }
        else
        {
            jQuery("div#submit").show();
        }
        });
    </script>
<?php endif;?>
